Well, thanks for the quick explanation. Got some good sources for this? Maybe a tutorial? I just wanna use it from time to time. To understand how it works is important, but i dont think I can do it myself with this explanation :)
No, i didn't used tutorials, but i believe you can find this algoritm by searching "Snow deformation shader"
And for example, here is messy code from this game, though i suggest you to search for tutorials first, since this is not exactly plug & play:
https://gist.github.com/3DI70R/7ce7fa8b10ac02cc430d7db7dfe7d692
https://gist.github.com/3DI70R/52be1a8e917d476c0a953ed1a577876e